Using warnings might help understand at least one problem:
Use of uninitialized value in subroutine entry at C:/Perl/site/lib/Win32/GUI.pm line 3419 during global destruction.
Chasing that backwards, '">E&xit"' looks a tad off.
Even together, these are not the whole ball of wax, but they're a start. You might wish to sprinkle in some additional debug messages ... and re-read the doc ( perldoc -f Win32::GUI ).
And, yes, I see the same problems with Win7, AS Perl 5.018 but don't have time to chase them all to completion.